EXPECT_EQ(grad_result[0].NumElements(), 1);
  EXPECT_EQ(grad_result[0].flat<float>()(0), 17610.0f);
}

TEST_F(GradientsTest, AddSymbolicGradientsTest) {
  Scope scope = Scope::NewRootScope();
  for (int cnt = 0; cnt < 100; ++cnt) {
    int N = 5 + rand() % 10;
    // Construct forward graph.
    OutputList inputs;
    for (int i = 0; i < N; ++i) {
      auto a = Const(scope, i, {1});
      inputs.push_back(a);
    }

//
// H0 = a + H0
// H1 = b + H1
// H2 = c + H2
// H3 = d + H3
// H4 = e + H4
// H5 = f + H5
// H6 = g + H6
// H7 = h + H7

#define CTX	R3
#define INP	R4
#define END	R5
#define TBL	R6
#define CNT	R8
#define LEN	R9
#define TEMP	R12

#define TBL_STRT R7 // Pointer to start of kcon table.

#define R_x000	R0
#define R_x010	R10
#define R_x020	R25
#define R_x030	R26
#define R_x040	R14

	ts.setNsec(ns)
	futex(unsafe.Pointer(addr), _FUTEX_WAIT_PRIVATE, val, unsafe.Pointer(&ts), nil, 0)
}

// If any procs are sleeping on addr, wake up at most cnt.
//
//go:nosplit
func futexwakeup(addr *uint32, cnt uint32) {
	ret := futex(unsafe.Pointer(addr), _FUTEX_WAKE_PRIVATE, cnt, nil, nil, 0)
	if ret >= 0 {
		return
	}

	// I don't know that futex wakeup can return
	// EAGAIN or EINTR, but if it does, it would be

		}

		if match > 0 {
			if err := r.copyFromWindow(&rbr, offset, match); err != nil {
				return err
			}
		}
	}

	r.buffer = append(r.buffer, litbuf...)

	if rbr.cnt != 0 {
		return r.makeError(off, "extraneous data after sequences")
	}

	return nil
}

// Copy match bytes from the decoded output, or the window, at offset.

		if vers != 1 {
			break
		}
		cnt := f.ByteOrder.Uint16(d[i+2 : i+4])
		fileoff := f.ByteOrder.Uint32(d[i+4 : i+8])
		aux := f.ByteOrder.Uint32(d[i+8 : i+12])
		next := f.ByteOrder.Uint32(d[i+12 : i+16])
		file, _ := getString(str, int(fileoff))

		var name string
		j := i + int(aux)
		for c := 0; c < int(cnt); c++ {
			if j+16 > len(d) {
				break
			}

	var (
		cntNewline int64
		buf        bytes.Buffer
		blk        block
	)

	// feedTokens copies data in blocks from r into buf until there are
	// at least cnt newlines in buf. It will not read more blocks than needed.
	feedTokens := func(n int64) error {
		for cntNewline < n {
			if _, err := mustReadFull(r, blk[:]); err != nil {
				return err
			}
			buf.Write(blk[:])

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